One change related to startup might impact some unsupported scenarios.
PowerShell no longer reads the files $pshome\*.ps1xml -- these files have been converted to C# to avoid some file
and CPU overhead of processing the XML files.
The files still exist to support V2 side-by-side, so if you change the file contents, it will not have any effect to V5, only V2.
Note that changing the contents of these files was never a supported scenario.

Another visible change is how PowerShell caches the exported commands and other information for
modules that are installed on a system.
Previously, this cache was stored in the directory $env:LOCALAPPDATA\Microsoft\Windows\PowerShell\CommandAnalysis.
In WMF 5.1, the cache is a single file $env:LOCALAPPDATA\Microsoft\Windows\PowerShell\ModuleAnalysisCache.
See Module Analysis Cache for more details.

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